Smith's Cloud

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What Wikipedia says

Smith's Cloud is a high-velocity cloud of hydrogen gas located in the constellation Aquila at Galactic coordinates l = 39°, b = −13°. The cloud was discovered in 1963 by Gail Bieger, née Smith, who was an astronomy student at Leiden University in the Netherlands.

Excerpt from the Wikipedia article “Smith's Cloud”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Bill Saxton, NRAO/AUI/NSF, CC BY 4.0, via Wikimedia Commons.